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Polyethylenimine as a new emulsion breaker for quench water systems

Pending Publication Date: 2022-03-03
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a new method for improving the efficiency and water quality of steam cracking systems by using a special chemical called non-alkoxylated branched or linear polyethylenimine (PEI) to inhibit the formation of emulsions and improve the water quality entering the system. This method also reduces the accumulation of fouling in the system, which prevents plant throughput reduction and improves energy efficiency. The patent also describes a quench water composition that includes gasoline hydrocarbons and other organic materials, which can be effectively removed using PEI. Overall, this patent provides a better understanding of the causes of fouling and a solution for improving the performance of steam cracking systems.

Problems solved by technology

If unchecked, increased contamination can lead to fouling, foaming, corrosion and product quality issues.
This complex water loop can experience a variety of problems due to contamination.
By way of example, emulsions formed in a QWT and / or quench water settler (QWS) during gasoline / water separation can lead to high amounts of hydrocarbons sent with water to the PWS.
This can result in fouling not only at the bottom of the stripper, but also at the dilution steam generator (DSG) preheaters which can effect throughput efficiency and, in worse cases, lead to plant shutdowns.

Method used

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  • Polyethylenimine as a new emulsion breaker for quench water systems
  • Polyethylenimine as a new emulsion breaker for quench water systems
  • Polyethylenimine as a new emulsion breaker for quench water systems

Examples

Experimental program
Comparison scheme
Effect test

example 1

Bottle Tests

[0036]Bottle tests were performed using process water and gasoline from the quench water tower (QWT) of a naphtha olefin cracker. Process water (10 mL) and gasoline (10 mL) were added to vials containing different concentrations of emulsion breaker (e.g., 0 to 50 ppm). The vials were hand-shaken at room temperature and the turbidity of the water was measured. Lower residual turbidity values were desired.

[0037]FIG. 1 shows the turbidity results from the bottle tests in Example 1. Branched PEI data points 10 (Mw ˜800 g / mol), 12 (Mw ˜1300 g / mol), 14 (Mw ˜750,000 g / mol) of the present invention, and comparative sample 16 (commercial non-PEI emulsion breaker A) were tested at several ppm (e.g., 0 to 50 ppm). From the results it was determined that the non-alkoxylated branched or linear PEI emulsion breakers had a normalized residual turbidity that was lower than Commercial non-PEI emulsion breakers A. Furthermore, the comparative sample 16 contained polyepichlorhydrin and tri...

example 2

Demulsification Tests

[0038]Demulsification tests were performed using process water and gasoline from the quench water tower (QWT) of a naphtha olefin cracker. Process water (60 mL) and gasoline (60 mL) were added to multiple vessels and each vessel was heated at 80° C. for 30 min. After cooling the mixtures where then stirred at 1000 rpm for 5 min and then added different concentrations of emulsion breaker (e.g., 0, 1, 5, and 10 ppm) followed by stirring for an additional 15 min and then the stirring is stopped. After complete demulsification, the turbidity of each water phase was measured. The lower the residual turbidity, the better the demulsification.

[0039]FIG. 2 shows the turbidity results of branched PEI 20 (Mw ˜1300 g / mol) of the present invention, comparative sample 22 (commercial non-PEI emulsion breaker A), and comparative sample 24, (commercial non-PEI emulsion breaker B). The branched PEI 20 reached lower residual turbidity levels, which makes the material more suitable...

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Abstract

Methods to increase the efficiency and throughput of hydrocarbon stream cracking by inhibiting the formation of, or resolving an emulsion, in an ethylene production quench water system. The method includes contacting a non-alkoxylated branched or linear polyethylenimine (PEI) with a quench water composition from the quench water system under conditions suitable to prevent the formation of an emulsion or to resolve the quench water composition into two immiscible phases.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]None.BACKGROUND OF THE INVENTIONA. Field of the Invention[0002]The invention generally concerns methods to increase the efficiency of resolving emulsions. In particular, the invention concerns the use of a new emulsion breaker for hydrocarbon / water systems that inhibits the formation of emulsions and carry-over of hydrocarbon contaminants into the water system (e.g., dilutions steam systems (DSS), oil fields, and the like).B. Description of Related Art[0003]During routine operation of steam cracking systems in the petroleum industry, significant quantities of hydrocarbons and other contaminants can concentrate in the process water. These contaminants must be removed or controlled to minimize problems throughout the process water system. If unchecked, increased contamination can lead to fouling, foaming, corrosion and product quality issues. This is particularly common in olefins production, where the process water system can include a que...

Claims

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Application Information

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IPC IPC(8): B01D17/04C02F1/68C08G73/02C10G33/04
CPCB01D17/047C02F1/682C02F2101/32C10G33/04C08G73/0206C02F2103/365
Inventor CUOQ, FABRICELEEN, STEVEN
Owner SABIC GLOBAL TECH BV